83
Real time clock module
84
Real time clock module
Real time clock module
The details are mentioned in the application manual.
Actual size
RTC-4574JERTC-4574SA
SERIAL REAL TIME CLOCK MODULE
RTC-4574SA / JE / NB
Product number (please refer to page 5)
Q4145745x000200 Q4145747x000100
Q4145749xxxxx00
• Built-in crystal unit allows adjustment-free efficient operation.
• Serial interface which can be controlled by three signal lines.
• Alarm interrupt function for day of week, day, hour, and minute.
• Timer interrupt function which can be set up between 1/4096 second and 255 minutes .
•
Dedicated interrupt output of the two systems (alarm and regular cycle) which allows software masking.
• Ability to detect stopping of oscillation and time update.
• Wide range of interface voltage and clock voltage between 1.6 V and 5.5 V.
• Low power consumption at 0.5 µA / 3 V. (Typ.)
• Available for lead (Pb) - free soldering.
• Available for lead (Pb) - free terminal.
Specifications (characteristics)
Absolute Max. rating
Item Symbol Condition Min. Max. Unit
Supply voltage VDD VDD to GND -0.3 +7.0
V
Input voltage VIN Input Pin
GND -0.3
VDD +0.3
Output voltage VOUT1 T
_______
IRQ, A
_______
IRQ +8.0
VOUT2 FOUT, DATA VDD +0.3
Storage temperature TSTG Stored as bare product
after unpacking -55 +125 °C
Operating range
Item Symbol Condition Min. Max. Unit
Power voltage VDD −1.6 5.5 V
Clock voltage VCLK −
Operating temperature TOPR No condensation -40 +85 °C
Frequency characteristics
Item Symbol Condition Range Unit
Frequency tolerance Δf/f Ta = +25 °C, VDD = 3 V
B: 5 ±23∗
x 10-6
Oscillation start up time
tSTA Ta = +25 °C, VDD = 1.6 V 3 Max. s
Frequency temperature
characteristics Top
Ta = -20 °C to +70 °C
Reference at +25 °C
+10
-120 x 10-6
Frequency voltage characteristics
f/V
Ta = +25 °C, VDD =
1.6
V to 5.5 V
±2
x 10-6 / V
Aging fa Ta = +25 °C, VDD = 3 V ±5
x 10-6 / year
∗ Please ask tighter tolerance.
DC characteristics
(GND = 0 V, VDD = 1.8 V to 5.5 V, Ta = -40 °C to +85 °C)
Item
Symbol
Condition Min. Typ. Max.
Unit
Standby current 1 IDD2
VDD = 5 V
CE0, CE1 = GND
DATA , A
____
IRQ, T
_____
IRQ VDD
–
1.0 2.0 µA
Standby current 2 IDD2
VDD = 3 V
0.5 1.0
Input voltage VIH CE0, CE1, CLK,
DATA, FCON pins
0.8 VDD
–
VDD V
VIL 0
0.2 VDD
Output voltage 1
VOH1 VDD = 5 V
IOH = -1 mA
DATA, FOUT pins
4.5
–
5.0
V
VOH2
VDD = 3 V
2.0
3.0
VOH3
IOH = -100 µA
DATA, FOUT pins
2.9
Output voltage 2
VOL1 VDD = 5 V
IOL = 1 mA
DATA, FOUT pins
GND
GND +0.5
VOL2
VDD = 3 V
GND +0.8
VOL3
IOL = 100 µA
DATA, FOUT pins
GND +0.1
VOL4 VDD = 5 V
IOL = 1 mA
A
______
IRQ, T
______
IRQ pins
GND +0.25
VOL5 VDD = 3 V
GND +0.4
External dimensions / Terminal connection (Unit: mm)
No.
1
2
3
4
5
6
7
Pin terminal
GND
FOUT
N.C
N.C
N.C
N.C
VDD
No.
14
13
12
11
10
9
8
Pin terminal
FCON
CE1
DATA
CLK
TIRQ
AIRQ
CE0
No.
1
2
3
4
5
6
7
8
9
10
Pin terminal
VDD
FOUT
CE0
AIRQ
TIRQ
CLK
DATA
CE1
FCON
GND
No.
20
19
18
17
16
15
14
13
12
11
Pin terminal
N.C
N.C
N.C
N.C
N.C
N.C
N.C
N.C
N.C
N.C
#1 #7
#20 #11
#1 #10
#22 #14
#1 #11
#8#14
(SOP 14-pin)
(VSOJ 20-pin)
7.4±0.2
3.2±0.1
1.2
1.270.35
5.03.1
10.1±0.2
0.15
0.6 0.05 Min.
0° to 10°
Metal may be exposed on the top or bottom of this product. This won't affect any quality, reliability or electrical spec.
1.5 Max.
5.4
1.3
(0.75) (0.75)
7.0±0.3
6.0 ±0.2
0.65 0.22 0 Min.
No.
1
2
3
4
5
6
7
8
9
10
11
Pin terminal
GND
FCON
N.C
CE1
DATA
CLK
TIRQ
AIRQ
CE0
FOUT
VDD
No.
22
21
20
19
18
17
16
15
14
(13)
(12)
Pin terminal
N.C
N.C
N.C
N.C
N.C
N.C
N.C
N.C
N.C
-
-
(SON 22-pin)
6.3 Max.
4.8
5.0±0.2
1.3
0.5 0.2
±0.1
RTC-4574NB
83
Real time clock module
84
Real time clock module
Register table
Address Register symbol bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
0 Sec fos S 40 S 20 S 10 S 8 S 4 S 2 S 1
1 Min fr Min 40 Min 20 Min 10 Min 8 Min 4 Min 2 Min 1
2 Hour fr 0 Hour 20 Hour 10 Hour 8 Hour 4 Hour 2 Hour 1
3 Day of Week fr W 6 W 5 W 4 W 3 W 2 W 1 W 0
4 Day fr 0 Day 20 Day 10 Day 8 Day 4 Day 2 Day 1
5 Month fr 0 0 Month 10 Month 8 Month 4 Month 2 Month 1
6 Year Year 80 Year 40 Year 20 Year 10 Year 8 Year 4 Year 2 Year 1
7 Minutes Alarm AE A-Min 40 A-Min 20 A-Min 10 A-Min 8 A-Min 4 A-Min 2 A-Min 1
8 Hours Alarm AE ∗A-Hr20 A-Hr10 A-Hr8 A-Hr4 A-Hr2 A-Hr1
9 Week Alarm AE A-W 6 A-W 5 A-W 4 A-W 3 A-W 2 A-W 1 A-W 0
A Day Alarm AE ∗A-Day 20 A-Day 10 A-Day 8 A-Day 4 A-Day 2 A-Day 1
B FOUT control FE ∗FD4FD3∗FD2FD1FD0
C Timer interrupt control TE ∗TD1TD0∗ ∗ ∗ ∗
D Count Down Timer Timer 128 Timer 64 Timer 32 Timer 16 Timer 8 Timer 4 Timer 2 Timer 1
E Control 1 0 0 0 TI / TP AF TF AIE TIE
F Control 2 0 TEST STOP RESET HOLD 0 0 0
AC characteristics
(GND = 0 V, Ta = -40 °C to +85 °C)
Item
Symbol
Control
VDD = 3.0 V ± 10 % VDD = 5.0 V ± 10 %
Unit
Min.
Max.
Min.
Max.
CLK clock cycle tCLK
–
800
–
350
–
ns
CLK H Pulse Width tWH
400 175
CLK L Pulse Width tWL
CE setup time tCS
CE hold time tCH
CE recovery time tCR 600 300
Write data setup time tDS 100 50
Write data hold time tDH 80
Write data disable delay time
tWZ 0 0
Read data delay time tRD
CL = 50 pF
–
300
–
120
Output disable time tRZ
CL = 50 pF
RL = 10 kΩ
200 100
Rise and fall time tRF
–
100 50
FOUT duty ratio
(32.768 kHz output)
Duty
35 65 40 60 %
Timing chart
tCH
tRF
tRF
tWL
tCLK
tDS tDH
D0 D1 D6 D7 D0 D6 D7
D0 D1 D6 D7 D0 D6 D7
tWZ
tRD tRZ
tWH
tCS tCR
CE
CLK
DATA
Data Read
DATA
Data Write
50 %
50 %
10 %
90 %
90 %
(Write data)
(Read data)
From here the DATA pin turns into the output mode.
(Setup code, setup address)
(Setup code, setup address)
10 %
Block diagram
Bus interface circuit
Output controller
Divider
FOUT
TIRQ
AIRQ
DATA
CLK
FCON
CE1
CE0
Clock and Calendar
Timer register
Alarm register
Control register
Shift register
Interrupts controller
OSC
32.768 kHz Control line
